Deoxidation casting, aluminium casting and casting machine

Abstract

The method of deoxidation casting is capable of deoxidizing the oxide film formed on the surface of the molten metal, improving wettability to inner faces of a cavity of a casting die, and casting high quality products with high casting efficiency. The method of deoxidation casting includes the steps of reacting a deoxidizing compound, which is made by reacting a metallic gas on a reactive gas, on a molten metal; and deoxidizing an oxide film on a surface of the molten metal.

What is claimed is:  
     
       1. A method of deoxidation casting, 
       comprising the steps of:  
       reacting a metallic gas and a reactive gas to form a deoxidizing compound;  
       reacting the deoxidizing compound with a molten metal; and  
       deoxidizing an oxide film on a surface of the molten metal;  
       wherein said deoxidizing compound reacts on the molten metal so as to deoxidize the oxide film on the surface of the molten metal as the molten metal is poured into a cavity.  
     
     
       2. The method of according to  claim 1 , wherein the molten metal is poured into the cavity of the casting die after a non-oxygen atmosphere is produced in the cavity. 
     
     
       3. The method according to  claim 1 , wherein the non-oxygen atmosphere is produced by decompressing the cavity of the casting die. 
     
     
       4. The method according to  claim 1 , wherein the non-oxygen atmosphere is produced by introducing an inert gas into the cavity of the casting die and purging air therefrom. 
     
     
       5. A method of deoxidation casting, 
       comprising the steps of:  
       reacting a metallic gas and a reactive gas to form a deoxidizing compound;  
       reacting the deoxidizing compound with a molten metal; and  
       deoxidizing an oxide film on a surface of the molten metal,  
       wherein said deoxidizing compound is made by respectively introducing said metallic gas and said reactive gas to a cavity of a casting die and reacting said both gasses so that said deoxidizing compound is precipitated on an inner face of the cavity, and casting is executed by pouring said molten metal into the cavity.  
     
     
       6. The method according to  claim 5 , 
       wherein the said metallic gas and said reactive gas are respectively introduced into the cavity via introducing holes, which are formed in the casting die and communicated to the cavity.  
     
     
       7. The method according to  claim 5 , 
       wherein an inert gas is used, as a carrier gas, for introducing said metallic gas into the cavity of the casting die.  
     
     
       8. The method according to  claim 5 , 
       wherein said metallic gas is introduced into the cavity of the casting die after a non-oxygen atmosphere is produced in the cavity.  
     
     
       9. The method according to  claim 8 , 
       wherein the non-oxygen atmosphere is produced by decompressing the cavity of the casting die.  
     
     
       10. The method according to  claim 8 , 
       wherein the non-oxygen atmosphere is produced by introducing an inert gas into the cavity of the die and purging air therefrom.  
     
     
       11. The method according to  claim 5 , 
       wherein the cavity is pressurized by a gas, which reacts on said deoxidizing compound in the cavity, and  
       the molten metal is poured into the pressurized cavity.  
     
     
       12. A method of deoxidation casting, comprising the steps of: 
       reacting a metallic gas and a reactive gas to form a deoxidizing compound;  
       reacting the deoxidizing compound with a molten metal; and  
       deoxidizing an oxide film on a surface of the molten metal,  
       wherein said metallic gas and said reactive gas are reacted outside of the casting die so as to make said deoxidizing compound, and  
       said deoxidizing compound is introduced into the cavity of the casting die, then the molten metal is poured into the cavity.  
     
     
       13. The method according to  claim 12 , 
       wherein an inert gas introduces said deoxidizing compound into the cavity of the casting die as a carrier gas.  
     
     
       14. The method according to  claim 12 , 
       wherein a non-oxygen atmosphere is produced in the cavity, then said deoxidizing compound is introduced into the cavity.  
     
     
       15. The method according to  claim 14 , 
       wherein the non-oxygen atmosphere is produced by decompressing the cavity of the casting die.  
     
     
       16. The method according to  claim 14 , 
       wherein the non-oxygen atmosphere is produced by introducing an inert gas into the cavity and purging air therefrom.  
     
     
       17. The method according to  claim 12 , 
       wherein the cavity is pressurized by a gas, which reacts on said deoxidizing compound in the cavity, and  
       the molten metal is poured into the pressurized cavity.  
     
     
       18. A method of deoxidation casting, 
       comprising the steps of:  
       reacting a magnesium nitride compound, which is made by reacting a magnesium gas with a nitrogen gas, on molten aluminum; and  
       deoxidizing an oxide film on a surface of the molten aluminum,  
       wherein said magnesium nitride compound is made by respectively introducing said magnesium gas and said nitrogen gas to a cavity of a casting die and reacting said both gasses so that said magnesium nitride compound is precipitated on an inner face of the cavity, and  
       casting is executed by pouring said molten aluminum into the cavity.  
     
     
       19. The method according to  claim 18 , 
       wherein an argon gas is used, as a carrier gas, for introducing said magnesium gas into the cavity of the casting die.  
     
     
       20. A method of deoxidation casting, 
       comprising the steps of:  
       reacting a magnesium nitride compound, which is made by reacting a magnesium gas with a nitrogen gas, on molten aluminum; and  
       deoxidizing an oxide film on a surface of the molten aluminum,  
       wherein said magnesium gas and said nitrogen gas are reacted outside of the casting die so as to make said magnesium nitride compound, and  
       said magnesium nitride compound is introduced into the cavity of the casting die, then the molten aluminum is poured into the cavity.  
     
     
       21. The method according to  claim 20 , 
       wherein an argon gas is used, as a carrier gas, for introducing said magnesium gas into the cavity of the casting die.  
     
     
       22. A deoxidation casting machine, in which a magnesium nitride compound, which is made by reacting a magnesium gas on a nitrogen gas, is reacted with molten aluminum, and an oxide film on a surface of the molten aluminum is deoxidized by the magnesium nitride compound, 
       comprising:  
       a casting die having a cavity, into which molten aluminum is poured so as to cast the aluminum into a prescribed shape;  
       means for introducing the nitrogen gas into the cavity;  
       a magnesium supply;  
       a furnace for generating the magnesium gas by heating and subliming magnesium; and  
       means for introducing the magnesium gas from said furnace to the cavity of said casting die together with a carrier gas so as to make the magnesium nitride compound by reacting the magnesium gas on the nitrogen gas in the cavity so that said magnesium nitride compound is precipitated on an inner face of the cavity.  
     
     
       23. A deoxidation casting machine, in which a magnesium nitride compound, which is made by reacting a magnesium gas on a nitrogen gas, is reacted with molten aluminum, and an oxide film on a surface of the molten aluminum is deoxidized by the magnesium nitride compound, 
       comprising:  
       a casting die having a cavity, into which molten aluminum is poured so as to cast the  
       aluminum into a prescribed shape;  
       a reaction chamber being separated from said casting die;  
       a magnesium supply;  
       means for introducing the nitrogen gas and magnesium into said reaction chamber; and  
       means for introducing the magnesium nitride compound, which is made in said reaction chamber by reacting the magnesium gas, which is generated by heating and subliming the magnesium, on the nitrogen gas, into the cavity together with a carrier gas.